Abstract: Governance by law is an important innovation of the CPC governing idea,and it has great significance in pushing forward the building of socialist democratic politics and the socialist harmonious society.Also it embodies the value of equality,human rights,order and efficiency.Governing by law is a political declaration,and what is more,it is political conduction principles and the deed standard of modern political civilization.It is necessary for the party in power to transform the governing idea and to strengthen the governing sense,and to legalize the governing procedures,to investigate the legal responsibility of law-breakers in governing process,and to achieve the value goal of governing by law.